Is your Office365 driving you nuts by forcing you and your team to change your password every 90 days? If you are the administrator, you can change this easily.
1. Log into your Office 365 account at: https://login.microsoftonline.com
2. On the left hand side, click 'service settings'
3. Then choose passwords from the options
4. Fill in the fields to set a longer expiration time (maximum is 720 days) and days before user is notified (maximum is 30)
This will now allow a maximum of almost two years between passwords expiring and should be more than enough time to ensure you / your users have plenty of time to do so. Note: I had problems doing this with Safari (Apple/Microsoft rivalry?) so used Chrome instead.
If however you want to disable it completley, then some work is involved - see this link by Microsoft: http://onlinehelp.microsoft.com/en-gb/office365-enterprises/hh534387.aspx#BKMK_not_expire